# Sorobaco: Soroban Mental Math — Soroban mental math trainer

> Soroban mental math trainer (iPhone/iPad app by MERCURIO SAS DI INFANTE LUCA & C..)

- Source: https://appshunter.io/ios/app/sorobaco-soroban-mental-math/id6760806680 (this page in markdown: same URL + `.md`)
- Developer: [MERCURIO SAS DI INFANTE LUCA & C.](https://appshunter.io/developer/1857594853)
- Category: Education, Games
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.2 · 1 MB
- Languages: English, Italian, Portuguese, Spanish
- Released: 2026-04-23
- Data updated: 2026-10-01
- User reviews in markdown: https://appshunter.io/ios/app/sorobaco-soroban-mental-math/id6760806680/reviews.md

## What is Sorobaco?

Sorobaco is a mental arithmetic training system built around the Soroban. Not a game. Not a tutorial. A tool that observes how you think under pressure.

SESSIONS

Each session unfolds across three progressive phases.

Phase 1: Familiarisation. The full equation is visible: 25 + 8 = 33. Learn the gestures without cognitive pressure.
Phase 2: Verification. Only the question: 25 + 8 = ?. Calculate the result and set it on the Soroban.
Phase 3: Challenge. Only the operation: + 8. Hold the current value in mind and apply it, the first step toward pure mental arithmetic (Anzan). Each time you lose track and reset the Soroban, a rewind is counted.

Validation is silent. When the soroban matches the target, the session continues. No buttons. No confirmation.

ADAPTIVE PRESSURE

There is no visible timer. The system watches your hesitations and recoveries and responds. Flow in: pressure steadies. Hesitation: pressure builds. Clean sequence: a moment of ease. The time does not punish. It responds.

COGNITIVE STATES

After each session, Sorobaco reflects your performance through three states:

Load: slowdowns, over-conscious attention, long hesitations.
Flow: continuous action, stable rhythm, comfortable pace.
Automatism: rapid, implicit decisions, minimal hesitation.

No scores. No stars. An honest mirror.

SESSIONS END NATURALLY

When your hesitation pattern sustains instability long enough, the session closes on its own. No countdown. No announcement. The flow simply stops.

PRIVACY

No data collected. Your practice history stays in your own iCloud. No ads. No subscriptions. One optional in-app tip to support independent development.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Support Sorobaco | $1.99 | one-time |



## Version history (last 3 releases)

### 2.1.0 — 2026-09-22

Sorobaco now speaks Portuguese, both the European and the Brazilian form, which brings it to five languages.

It also follows the Reduce Motion setting. With that on, the pulse under the question mark and the shudder that marks a mistake give way to quieter changes that say the same thing without moving anything on screen.

Three buttons on the Home screen were announcing the icon rather than the place they open, and VoiceOver repeated that faithfully. They now say what they do. The piece called Toward anzan has been rewritten.

### 2.0.0 — 2026-08-19

Sorobaco is now on Mac, and your practice history follows you through iCloud.
The cognitive profile no longer reports a session too short to measure as if it were perfect flow.
New: your three cognitive states drawn over time, so you can see whether automatism is growing.
New: a short read on what anzan is, and how far Sorobaco takes you toward it.

### 1.0.0 — 2026-04-23

No release notes.

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All apps by MERCURIO SAS DI INFANTE LUCA & C.: https://appshunter.io/developer/1857594853

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-01.*